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using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata;
using Microsoft.EntityFrameworkCore.Metadata.Builders;
using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
using System;
namespace Timeline.Entities
{
// Copied from https://github.com/dotnet/efcore/issues/4711#issuecomment-589842988
public static class UtcDateAnnotation
{
private const string IsUtcAnnotation = "IsUtc";
private static readonly ValueConverter<DateTime, DateTime> UtcConverter =
new ValueConverter<DateTime, DateTime>(v => v, v => DateTime.SpecifyKind(v, DateTimeKind.Utc));
public static PropertyBuilder<TProperty> IsUtc<TProperty>(this PropertyBuilder<TProperty> builder, bool isUtc = true) =>
builder.HasAnnotation(IsUtcAnnotation, isUtc);
public static bool IsUtc(this IMutableProperty property) =>
((bool?)property.FindAnnotation(IsUtcAnnotation)?.Value) ?? true;
/// <summary>
/// Make sure this is called after configuring all your entities.
/// </summary>
public static void ApplyUtcDateTimeConverter(this ModelBuilder builder)
{
foreach (var entityType in builder.Model.GetEntityTypes())
{
foreach (var property in entityType.GetProperties())
{
if (!property.IsUtc())
{
continue;
}
if (property.ClrType == typeof(DateTime))
{
property.SetValueConverter(UtcConverter);
}
}
}
}
}
}
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